Abthur w



(No Medel.) I v A; W. BROWNE.

FLEXIBLE DRIVING SPRING.

Patented Mar. 22, 1887.

7 whereby another prev1ous application,filed June 5,1886,

' Princes Bay. 111 the county of Richmond and State of New York, have invented certain new and the ends of said capsare then burnished and useful lmprovementsin Flexible Drivingor pressed down into the grooves a a, to se' Springs; and I do hereby declare the follow cnrely retain them in place; The protectoring to be av full, clear, and exact description of cap for the end of'thespring is preferablycon- Aren't @rrion.

ARTHUR w; nnownn, or PRINCES BAY, n. Y., Assieiion'To *rnn s. s. lVHITE j DENTAL M ANUF AGTURING COMPANY, or rnnnnnnenrn, PA.

FLEXlBLE unwind-sparse.

Letters ammo. $159,841, dated March 22, 1887.

209,055. (No model l SPECIFICATION forming part of Application filed July 26, 1836. Serial No.

grooves a u, with the surfaces of the grooves preferably left'rongh' in turning them. The open ends of caps or.thimbles B 7 B are passed on over the ends of the spring, 50

To all wi'wnt it may concern;

Be it known that I, ARTHUR W. Bnownn,

a citizen of the United States, residing at others skilled structed as shownthatis, with the inner end 55 to make and i open and the out-er end partially closed bya centrally-perforated disk, I), to permit the passage of the end'of the stiff shaft-section into the bore of the- 'spring. 5

The capped spring is secured upon the ends 60 of -thestifi shaft-sections C C by forcing the short .distanceinto the bore of the invention, such as will enable in the art to which it appertai-ns use the same. g My invention relates to flexible drivingsprings connecting stifi' sections of sh'afting, V the shaft is made a flexible one. for driving toolsin various directions, for example', or'to permit one section torot-ate at an shaft ends 2. angle to the other. It i the custom to the spring, which expands to permit the operunite thetubular flexible springs to the ends. ation, as usual. The interior diameter of the of the stiff shaft-sections by forcing the ends caps B is preferably slightly greater than the 6 5 of .said shaft-sections into the bore. of the external diameter of the spring, so that when spring, andthis force, in connecting the spring the shaftend is inserted in the spring and turned to expand it, to permit the progress of and shaft-sections or in disconnectingthem, sometimesinjuresthespring. Toguardagainst the shaft therein, the expansion of the spring is accommodated.

this and improve the operation and strength i I have thus illustrated and described my of the spring, I employ strengthening caps or thimbles for the ends of the sprin improvements as embodied and organized in the bestavay now known to me; and

g My improvements are sufficiently illustrated I claim herein as my iHVBDUOIl in the drawings; and said improvements will be distinctly recited at the close of this spent 1. A fiexible drivingshaft consisting of a 7 5 fication. tnbnlar driving-spring, strengthening-caps on In said drawings, Figure 1 is a View in elel the ends of said spring which allow saidends vation, partly in section, of my improvements to expand and contract therein and stiff shaft in driving-springs; and-Fig. 2 is a'longitudisections united to said spring y being forced nal section therethrough. Fig. 3 is asectional into the tubular capped ends thereof, substair 8o view of one of the preferred forms of caps or tially as described. l

protectors detached, and Fig; 4 is a cross-sec- 2'. Aflexible drivirg-spring havingagroove tion thereof. in its circumference and fitted with an end cap 5 The spring A is a hollow or tubular one, as or thinible, secured thereto by engaging said usual, and in this instance is shown as made groove, substantially as described.

up oftwo flat strips or ribbons placed side by In testimony whereof I affix my signature in side and twisted together to form the hollow presence of two"witnes ses.

or tubular spring. This is not claimed herein, ARTHUR v BROVNE however, and constitutes the subject-matter of r Witnesses:

W, A. Jonnsron,

o. 204,229, for Letters Patent made by me.

TnonxsC. Torres.

The spring is provided with circumferential 

